Specifications

Serial Communications (82050)
ZT 8832 SPECIFICS
The ACC serial port, available at connector J2, includes Transmit
Data (TxD), Receive Data (RxD), and support for a complete
selection of the following modem control functions:
• Clear To Send (CTS)
• Request To Send (RTS)
• Data Terminal Ready (DTR)
• Data Set Ready (DSR)
• Ring Indicator (RI)
• Data Carrier Detect (DCD)
The serial port is jumper configured to operate as either Data Com-
munication Equipment (DCE) or Data Terminal Equipment (DTE)
with either RS-232 or RS-485 protocols. Pin assignments for
connector J2 are shown in Appendix B for both RS-232 and RS-485
operation.
The ACC supports interrupt driven communications. The interrupt
output of the ACC is connected to the IR4 interrupt input of the V40
interrupt controller.
When the ACC serial port is jumper configured to operate in RS-485
mode, the DTR bit of the ACC Modem Control register enables and
disables the transmit and request to send buffers. (See page 11-13.)
Regardless of whether the ACC is configured to operate in RS-232 or
RS-485 mode, the OUT2 bit of the Modem Control register enables
and disables the 24 bits of parallel I/O local to the ZT 8832.
11-3